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1. Transition probability studies in ¹⁷⁵Au

Author

Grahn, T., Watkins, H., Joss, D. T., Page, R. D., Carroll, R. J., Dewald, A., Greenlees, P. T., Hackstein, M., Herzberg, R.-D., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kröll, Thorsten, Krücken, R., Labiche, M., Leino, M., Lumley, N., Maierbeck, P., Nyman, M., Nieminen, P., O'Donnell, D., Ollier, J., Pakarinen, J., Peura, P., Pissulla, Th., Rahkila, P., Revill, J. P., Rother, W., Ruotsalainen, P., Rigby, S. V., Sarén, J., Sapple, P. J., Scheck, M., Scholey, C., Simpson, J., Sorri, J., Uusitalo, J., Venhart, M., Grahn, T., Watkins, H., Joss, D. T., Page, R. D., Carroll, R. J., Dewald, A., Greenlees, P. T., Hackstein, M., Herzberg, R.-D., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kröll, Thorsten, Krücken, R., Labiche, M., Leino, M., Lumley, N., Maierbeck, P., Nyman, M., Nieminen, P., O'Donnell, D., Ollier, J., Pakarinen, J., Peura, P., Pissulla, Th., Rahkila, P., Revill, J. P., Rother, W., Ruotsalainen, P., Rigby, S. V., Sarén, J., Sapple, P. J., Scheck, M., Scholey, C., Simpson, J., Sorri, J., Uusitalo, J., and Venhart, M.

Abstract

Transition probabilities have been measured between the low-lying yrast states in ¹⁷⁵Au by employing the recoil distance Doppler-shift method combined with the selective recoil-decay tagging technique. Reduced transition probabilities and magnitudes of transition quadrupole moments have been extracted from measured lifetimes allowing dramatic changes in nuclear structure within a low excitation-energy range to probed. The transition quadrupole moment data are discussed in terms of available systematics as a function of atomic number and aligned angular momentum.

Published
2024

2. Transition probability studies in ¹⁷⁵Au

Author

Grahn, T., Watkins, H., Joss, D. T., Page, R. D., Carroll, R. J., Dewald, A., Greenlees, P. T., Hackstein, M., Herzberg, R-D., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kröll, Thorsten, Krücken, R., Labiche, M., Leino, M., Lumley, N., Maierbeck, P., Nyman, M., Nieminen, P., O'Donnell, D., Ollier, J., Pakarinen, J., Peura, P., Pissulla, Th., Rahkila, P., Revill, J. P., Rother, W., Ruotsalainen, P., Rigby, S. V., Sarén, J., Sapple, P. J., Scheck, M., Scholey, C., Simpson, J., Sorri, J., Uusitalo, J., Venhart, M., Grahn, T., Watkins, H., Joss, D. T., Page, R. D., Carroll, R. J., Dewald, A., Greenlees, P. T., Hackstein, M., Herzberg, R-D., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kröll, Thorsten, Krücken, R., Labiche, M., Leino, M., Lumley, N., Maierbeck, P., Nyman, M., Nieminen, P., O'Donnell, D., Ollier, J., Pakarinen, J., Peura, P., Pissulla, Th., Rahkila, P., Revill, J. P., Rother, W., Ruotsalainen, P., Rigby, S. V., Sarén, J., Sapple, P. J., Scheck, M., Scholey, C., Simpson, J., Sorri, J., Uusitalo, J., and Venhart, M.

Abstract

Transition probabilities have been measured between the low-lying yrast states in ¹⁷⁵Au by employing the recoil distance Doppler-shift method combined with the selective recoil-decay tagging technique. Reduced transition probabilities and magnitudes of transition quadrupole moments have been extracted from measured lifetimes allowing dramatic changes in nuclear structure within a low excitation-energy range to probed. The transition quadrupole moment data are discussed in terms of available systematics as a function of atomic number and aligned angular momentum.

Published
2024

3. Transition probability studies in ¹⁷⁵Au

Author

Grahn, T., Watkins, H., Joss, D. T., Page, R. D., Carroll, R. J., Dewald, A., Greenlees, P. T., Hackstein, M., Herzberg, R.-D., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kröll, Thorsten, Krücken, R., Labiche, M., Leino, M., Lumley, N., Maierbeck, P., Nyman, M., Nieminen, P., O'Donnell, D., Ollier, J., Pakarinen, J., Peura, P., Pissulla, Th., Rahkila, P., Revill, J. P., Rother, W., Ruotsalainen, P., Rigby, S. V., Sarén, J., Sapple, P. J., Scheck, M., Scholey, C., Simpson, J., Sorri, J., Uusitalo, J., Venhart, M., Grahn, T., Watkins, H., Joss, D. T., Page, R. D., Carroll, R. J., Dewald, A., Greenlees, P. T., Hackstein, M., Herzberg, R.-D., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kröll, Thorsten, Krücken, R., Labiche, M., Leino, M., Lumley, N., Maierbeck, P., Nyman, M., Nieminen, P., O'Donnell, D., Ollier, J., Pakarinen, J., Peura, P., Pissulla, Th., Rahkila, P., Revill, J. P., Rother, W., Ruotsalainen, P., Rigby, S. V., Sarén, J., Sapple, P. J., Scheck, M., Scholey, C., Simpson, J., Sorri, J., Uusitalo, J., and Venhart, M.

Abstract

Transition probabilities have been measured between the low-lying yrast states in ¹⁷⁵Au by employing the recoil distance Doppler-shift method combined with the selective recoil-decay tagging technique. Reduced transition probabilities and magnitudes of transition quadrupole moments have been extracted from measured lifetimes allowing dramatic changes in nuclear structure within a low excitation-energy range to probed. The transition quadrupole moment data are discussed in terms of available systematics as a function of atomic number and aligned angular momentum.

Published
2024

4. Transition probability studies in ¹⁷⁵Au

Author

Grahn, T., Watkins, H., Joss, D. T., Page, R. D., Carroll, R. J., Dewald, A., Greenlees, P. T., Hackstein, M., Herzberg, R.-D., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kröll, Thorsten, Krücken, R., Labiche, M., Leino, M., Lumley, N., Maierbeck, P., Nyman, M., Nieminen, P., O'Donnell, D., Ollier, J., Pakarinen, J., Peura, P., Pissulla, Th., Rahkila, P., Revill, J. P., Rother, W., Ruotsalainen, P., Rigby, S. V., Sarén, J., Sapple, P. J., Scheck, M., Scholey, C., Simpson, J., Sorri, J., Uusitalo, J., Venhart, M., Grahn, T., Watkins, H., Joss, D. T., Page, R. D., Carroll, R. J., Dewald, A., Greenlees, P. T., Hackstein, M., Herzberg, R.-D., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kröll, Thorsten, Krücken, R., Labiche, M., Leino, M., Lumley, N., Maierbeck, P., Nyman, M., Nieminen, P., O'Donnell, D., Ollier, J., Pakarinen, J., Peura, P., Pissulla, Th., Rahkila, P., Revill, J. P., Rother, W., Ruotsalainen, P., Rigby, S. V., Sarén, J., Sapple, P. J., Scheck, M., Scholey, C., Simpson, J., Sorri, J., Uusitalo, J., and Venhart, M.

Abstract

Transition probabilities have been measured between the low-lying yrast states in ¹⁷⁵Au by employing the recoil distance Doppler-shift method combined with the selective recoil-decay tagging technique. Reduced transition probabilities and magnitudes of transition quadrupole moments have been extracted from measured lifetimes allowing dramatic changes in nuclear structure within a low excitation-energy range to probed. The transition quadrupole moment data are discussed in terms of available systematics as a function of atomic number and aligned angular momentum.

Published
2024

5. High-spin states of ²¹⁸Th

Author

O'Donnell, D. (D.), Page, R. D. (R. D.), Grahn, T. (T.), Ali, F. A. (F. A.), Auranen, K. (K.), Capponi, L. (L.), Carroll, R. J. (R. J.), Chishti, M. M. (M. M. R.), Drummond, M. C. (M. C.), Greenlees, P. T. (P. T.), Henderson, J. (J.), Herzan, A. (A.), Jakobsson, U. (U.), Joss, D. T. (D. T.), Julin, R. (R.), Juutinen, S. (S.), Konki, J. (J.), Labiche, M. (M.), Leino, M. (M.), Mason, P. J. (P. J. R.), McPeake, C. G. (C. G.), Pakarinen, J. (J.), Papadakis, P. (P.), Partanen, J. (J.), Peura, P. (P.), Rahkila, P. (P.), Revill, J. (J.), Ruotsalainen, P. (P.), Sandzelius, M. (M.), Saren, J. (J.), Saygi, B. (B.), Scholey, C. (C.), Simpson, J. (J.), Smith, J. F. (J. F.), Smolen, M. (M.), Sorri, J. (J.), Stolze, S. (S.), Sullivan, C. M. (C. M.), Thornthwaite, A. (A.), Uusitalo, J. (J.), Kumar, A. (A.), Srivastava, P. C. (P. C.), O'Donnell, D. (D.), Page, R. D. (R. D.), Grahn, T. (T.), Ali, F. A. (F. A.), Auranen, K. (K.), Capponi, L. (L.), Carroll, R. J. (R. J.), Chishti, M. M. (M. M. R.), Drummond, M. C. (M. C.), Greenlees, P. T. (P. T.), Henderson, J. (J.), Herzan, A. (A.), Jakobsson, U. (U.), Joss, D. T. (D. T.), Julin, R. (R.), Juutinen, S. (S.), Konki, J. (J.), Labiche, M. (M.), Leino, M. (M.), Mason, P. J. (P. J. R.), McPeake, C. G. (C. G.), Pakarinen, J. (J.), Papadakis, P. (P.), Partanen, J. (J.), Peura, P. (P.), Rahkila, P. (P.), Revill, J. (J.), Ruotsalainen, P. (P.), Sandzelius, M. (M.), Saren, J. (J.), Saygi, B. (B.), Scholey, C. (C.), Simpson, J. (J.), Smith, J. F. (J. F.), Smolen, M. (M.), Sorri, J. (J.), Stolze, S. (S.), Sullivan, C. M. (C. M.), Thornthwaite, A. (A.), Uusitalo, J. (J.), Kumar, A. (A.), and Srivastava, P. C. (P. C.)

Abstract

High-spin states in the N = 128 nucleus ²¹⁸Th have been investigated following fusion–evaporation reactions, using the recoil-decay tagging technique. Due to the short-lived nature of the ground state of ²¹⁸Th prompt γ rays have been correlated with the α decay of the daughter nucleus ²¹⁴Ra. The level scheme representing the decay of excited states has been extended to (16⁺) with the observation of six previously unreported transitions. The observations are compared with the results of shell model calculations and within the context of the systematics of neighbouring nuclei.

Published
2020

6. The Role of International Organizations in WMD Compliance and Enforcement: Autonomy, Agency and Influence

Author

Revill, J, Findlay, T, Revill, J, and Findlay, T

Abstract

The paper considers the challenges and dilemmas facing international organizations in ensuring compliance with and enforcement of the three major weapons of mass destruction treaties by treaty parties. It draws on international organizations theory, especially principal-agent theory, in identifying potential pathways to enhanced compliance.

Published
2020

7. Decay of a 19(-) isomeric state in Lu-156

Author

Lewis, M. C., Parr, E., Page, R. D., McPeake, C., Joss, D. T., Ali, F. A., Auranen, K., Briscoe, A. D., Capponi, L., Grahn, T., Greenlees, P. T., Henderson, J., Herzan, A., Jakobsson, Ulrika, Julin, R., Juutinen, S., Konki, J., Labiche, M., Leino, M., Mason, P. J. R., Nyman, M., O'Donnell, D., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Revill, J. P., Ruotsalainen, P., Sandzelius, M., Saren, J., Saygi, B., Scholey, C., Simpson, J., Smith, J. F., Smolen, M., Sorri, J., Stolze, S., Thornthwaite, A., Uusitalo, J., Lewis, M. C., Parr, E., Page, R. D., McPeake, C., Joss, D. T., Ali, F. A., Auranen, K., Briscoe, A. D., Capponi, L., Grahn, T., Greenlees, P. T., Henderson, J., Herzan, A., Jakobsson, Ulrika, Julin, R., Juutinen, S., Konki, J., Labiche, M., Leino, M., Mason, P. J. R., Nyman, M., O'Donnell, D., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Revill, J. P., Ruotsalainen, P., Sandzelius, M., Saren, J., Saygi, B., Scholey, C., Simpson, J., Smith, J. F., Smolen, M., Sorri, J., Stolze, S., Thornthwaite, A., and Uusitalo, J.

Abstract

A multiparticle spin-trap isomeric state having a half-life of 179(4) ns and lying 2601 keV above the yrast 10(+) state in Lu-156 has been discovered. The Lu-156 nuclei were produced by bombarding isotopically enriched Cd-106 targets with beams of Ni-58 ions, separated in flight using the gas-filled separator RITU and their decays were measured using the GREAT spectrometer. Analysis of the main decay path that populates yrast states observed previously suggests a spin-parity assignment of 19(-) for the isomeric state, which is consistent with isomeric states identified in the N = 85 isotones. Comparison with other decay paths in Lu-156 indicates that the [pi h(11/)(2)(-1) circle times nu h(9/2)]10(+) state at the bottom of the yrast sequence is likely to be the a-decaying isomeric state, with the [pi h(11/)(2)(-1) circle times nu f(7/2)]9(+) state lying 62 keV above it. The relative ordering of the lowest-lying 9(+) and 10(+) states is inverted in Lu-156 compared with its odd-odd isotones., QC 20180821

Published
2018
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8. Fine structure in the alpha decay of high-spin isomers in Lu-155 and Hf-156

Author

Parr, E., Page, R. D., Joss, D. T., Ali, F. A., Auranen, K., Capponi, L., Grahn, T., Greenlees, P. T., Henderson, J., Herzan, A., Jakobsson, Ulrika, Julin, R., Juutinen, S., Konki, J., Labiche, M., Leino, M., Mason, P. J. R., McPeake, C., O'Donnell, D., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Revill, J. P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Simpson, J., Smith, J. F., Smolen, M., Sorri, J., Stolze, S., Thornthwaite, A., Uusitalo, J., Parr, E., Page, R. D., Joss, D. T., Ali, F. A., Auranen, K., Capponi, L., Grahn, T., Greenlees, P. T., Henderson, J., Herzan, A., Jakobsson, Ulrika, Julin, R., Juutinen, S., Konki, J., Labiche, M., Leino, M., Mason, P. J. R., McPeake, C., O'Donnell, D., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Revill, J. P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Simpson, J., Smith, J. F., Smolen, M., Sorri, J., Stolze, S., Thornthwaite, A., and Uusitalo, J.

Abstract

Fine structure in the a decay of high-spin isomers in Lu-155( 25/2(-)) and Hf-156(8(+))has been studied for the first time using alpha gamma- coincidence analysis. Three new a decays from Lu-155(25/2(-)) and two from Hf-156(8(+)) have been identified, populating seniority s > 1 states in the N = 82 nuclei Tm-151 and Yb-152, respectively. The reduced hindrance factors of the a decays support the previous configuration assignments of the populated states. This is the first observation of states with excitation energy greater than 1.5 MeV being populated following a decay in nuclei outside of the Pb-208 region., QC 20181218

Published
2018
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9. Collective excitations in the transitional nuclei Re-163 and Re-165

Author

Davis-Merry, T. R., Joss, D. T., Page, R. D., Simpson, J., Paul, E. S., Ali, F. A., Bianco, L., Carroll, R. J., Cederwall, Bo, Darby, I. G., Drummond, M. C., Eeckhaudt, S., Erturk, S., Gomez-Hornillos, M. B., Grahn, T., Greenlees, P. T., Hadinia, Baharak, Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Nieminen, P., Nyman, M., O'Donnell, D., Pakarinen, J., Peura, P., Rahkila, P., Revill, J. P., Ruotsalainen, P., Sandzelius, M., Sapple, P. J., Saren, J., Saygi, B., Scholey, C., Sorri, J., Thomson, J., Uusitalo, J., Davis-Merry, T. R., Joss, D. T., Page, R. D., Simpson, J., Paul, E. S., Ali, F. A., Bianco, L., Carroll, R. J., Cederwall, Bo, Darby, I. G., Drummond, M. C., Eeckhaudt, S., Erturk, S., Gomez-Hornillos, M. B., Grahn, T., Greenlees, P. T., Hadinia, Baharak, Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Nieminen, P., Nyman, M., O'Donnell, D., Pakarinen, J., Peura, P., Rahkila, P., Revill, J. P., Ruotsalainen, P., Sandzelius, M., Sapple, P. J., Saren, J., Saygi, B., Scholey, C., Sorri, J., Thomson, J., and Uusitalo, J.

Abstract

Excited states in the neutron-deficient nuclei (163)(75) Re-88 and (165)(75) Re-90 were populated in the Cd-106(Ni-60, p2n gamma) and Mo-92(Kr-78, 3p2n gamma) fusion-evaporation reactions at bombarding energies of 270 and 380 MeV, respectively.. rays were detected at the target position using the JUROGAM spectrometer while recoiling ions were separated in-flight by the RITU gas-filled recoil separator and implanted in the GREAT spectrometer. The energy level schemes for Re-163 and Re-165 were identified using recoil-decay correlation techniques. At low spin, the yrast bands of these isotopes consist of signature partner bands based on a single pi h(11/2) quasiproton configuration. The bands display large energy splitting consistent with the soft triaxial shape typical of transitional nuclei above N = 82. The configurations of the excited states are proposed within the framework of the cranked shell model., QC 20150429

Published
2015
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10. Electromagnetic transition strengths in Te-109(52)

Author

Procter, M. G., Cullen, D. M., Scholey, C., Ruotsalainen, P., Angus, L., Back, T., Cederwall, B., Dewald, A., Fransen, C., Grahn, T., Greenlees, P. T., Hackstein, M., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Liotta, R., Lumley, N. M., Mason, P. J. R., Nieminen, P., Nyman, M., Pakarinen, J., Pissulla, T., Peura, P., Rahkila, P., Revill, J., Rigby, S. V., Rother, W., Sandzelius, M., Saren, J., Sorri, J., Taylor, M. J., Uusitalo, J., Wady, P., Qi, C., Xu, F. R., Procter, M. G., Cullen, D. M., Scholey, C., Ruotsalainen, P., Angus, L., Back, T., Cederwall, B., Dewald, A., Fransen, C., Grahn, T., Greenlees, P. T., Hackstein, M., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Liotta, R., Lumley, N. M., Mason, P. J. R., Nieminen, P., Nyman, M., Pakarinen, J., Pissulla, T., Peura, P., Rahkila, P., Revill, J., Rigby, S. V., Rother, W., Sandzelius, M., Saren, J., Sorri, J., Taylor, M. J., Uusitalo, J., Wady, P., Qi, C., and Xu, F. R.

Abstract

Lifetime measurements have been made in the neutron-deficient nucleus Te-109 using the coincident recoil distance Doppler-shift method. The experimental B(E2) values have been compared with state-of-the-art shell-model calculations using the monopole-corrected realistic charge-dependent Bonn nucleon-nucleon potential. Lifetimes in the vh(11/2) band are consistent with an interpretation based on the deformation driving properties of a single valence neutron outside of the even-even tellurium core and highlight the unexpected presence of collective behavior as the N = 50 shell closure is approached. Lifetime measurements for the low-lying positive-parity states also appear to correlate well with shell-model calculations. In addition, a comparison with the proton-unbound nucleus I-109 suggests that the presence of a single decoupled valence proton affects the total measured B(E2) strengths in a manner that is not currently well understood.

Published
2012

11. Electromagnetic transition strengths in Te-109(52)

Author

Procter, M. G., Cullen, D. M., Scholey, C., Ruotsalainen, P., Angus, L., Back, T., Cederwall, B., Dewald, A., Fransen, C., Grahn, T., Greenlees, P. T., Hackstein, M., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Liotta, R., Lumley, N. M., Mason, P. J. R., Nieminen, P., Nyman, M., Pakarinen, J., Pissulla, T., Peura, P., Rahkila, P., Revill, J., Rigby, S. V., Rother, W., Sandzelius, M., Saren, J., Sorri, J., Taylor, M. J., Uusitalo, J., Wady, P., Qi, C., Xu, F. R., Procter, M. G., Cullen, D. M., Scholey, C., Ruotsalainen, P., Angus, L., Back, T., Cederwall, B., Dewald, A., Fransen, C., Grahn, T., Greenlees, P. T., Hackstein, M., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Liotta, R., Lumley, N. M., Mason, P. J. R., Nieminen, P., Nyman, M., Pakarinen, J., Pissulla, T., Peura, P., Rahkila, P., Revill, J., Rigby, S. V., Rother, W., Sandzelius, M., Saren, J., Sorri, J., Taylor, M. J., Uusitalo, J., Wady, P., Qi, C., and Xu, F. R.

Abstract

Lifetime measurements have been made in the neutron-deficient nucleus Te-109 using the coincident recoil distance Doppler-shift method. The experimental B(E2) values have been compared with state-of-the-art shell-model calculations using the monopole-corrected realistic charge-dependent Bonn nucleon-nucleon potential. Lifetimes in the vh(11/2) band are consistent with an interpretation based on the deformation driving properties of a single valence neutron outside of the even-even tellurium core and highlight the unexpected presence of collective behavior as the N = 50 shell closure is approached. Lifetime measurements for the low-lying positive-parity states also appear to correlate well with shell-model calculations. In addition, a comparison with the proton-unbound nucleus I-109 suggests that the presence of a single decoupled valence proton affects the total measured B(E2) strengths in a manner that is not currently well understood.

Published
2012

12. Anomalous transition strength in the proton-unbound nucleus (109)(53)I56

Author

Procter, M. G., Cullen, D. M., Scholey, C., Ruotsalainen, P., Angus, L., Bäck, Torbjörn, Cederwall, Bo, Dewald, A., Fransen, C., Grahn, T., Greenlees, P. T., Hackstein, M., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Liotta, Roberto, Lumley, N. M., Mason, P. J. R., Nieminen, P., Nyman, M., Pakarinen, J., Pissulla, T., Peura, P., Rahkila, P., Revill, J., Rigby, S. V., Rother, W., Sandzelius, M., Saren, J., Sorri, J., Taylor, M. J., Uusitalo, J., Wady, P., Qi, Chong, Xu, F. R., Procter, M. G., Cullen, D. M., Scholey, C., Ruotsalainen, P., Angus, L., Bäck, Torbjörn, Cederwall, Bo, Dewald, A., Fransen, C., Grahn, T., Greenlees, P. T., Hackstein, M., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Liotta, Roberto, Lumley, N. M., Mason, P. J. R., Nieminen, P., Nyman, M., Pakarinen, J., Pissulla, T., Peura, P., Rahkila, P., Revill, J., Rigby, S. V., Rother, W., Sandzelius, M., Saren, J., Sorri, J., Taylor, M. J., Uusitalo, J., Wady, P., Qi, Chong, and Xu, F. R.

Abstract

A lifetime measurement has been made for the first excited 11/2(+) state in the proton-unbound nucleus (109)(53)I56 using the recoil-distance Doppler-shift method in conjunction with recoil-proton tagging. The experimental reduced transition probability is considerably smaller than the prediction of theoretical shell-model calculations using the CD-Bonn nucleon-nucleon potential. The discrepancy between the theoretical and experimental reduced transition strengths in this work most likely arises from the inability of the current shell-model calculations to accurately account for the behavior of the unbound nuclear states., QC 20111212

Published
2011
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13. Lifetime measurement in the proton-unbound nucleus 109I

Author

Procter, M. G., Cullen, D. M., Ruotsalainen, P., Scholey, C., Angus, L., Bäck, Torbjörn, Cederwall, Bo, Dewald, A., Fransen, C., Grahn, T., Greenlees, P. T., Hackstein, M., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Lumley, N. M., Mason, P. J. R., Nieminen, P., Nyman, M., Pakarinen, J., Pissulla, T., Peura, P., Rahkila, P., Revill, J., Rigby, S. V., Rother, W., Sandzelius, M., Sarén, J., Sorri, J., Taylor, M. J., Uusitalo, J., Wady, P., Qi, C., Xu, F. R., Procter, M. G., Cullen, D. M., Ruotsalainen, P., Scholey, C., Angus, L., Bäck, Torbjörn, Cederwall, Bo, Dewald, A., Fransen, C., Grahn, T., Greenlees, P. T., Hackstein, M., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Lumley, N. M., Mason, P. J. R., Nieminen, P., Nyman, M., Pakarinen, J., Pissulla, T., Peura, P., Rahkila, P., Revill, J., Rigby, S. V., Rother, W., Sandzelius, M., Sarén, J., Sorri, J., Taylor, M. J., Uusitalo, J., Wady, P., Qi, C., and Xu, F. R.

Abstract

The Recoil-Distance Doppler-shift method has been combined with Recoil-Decay Tagging for the first time to measure a lifetime in the proton-unbound nucleus 109I. The lifetime value was determined using the Differential Decay-Curve method in singles mode. The result has been compared to theoretical shell-model calculations in order to better understand the nature of unbound valence nucleons at the proton drip line., QC 20140908

Published
2011
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14. Lifetime measurements probing triple shape coexistence in Au-175

Author

Watkins, H., Joss, D. T., Grahn, T., Page, R. D., Carroll, R. J., Dewald, A., Greenlees, P. T., Hackstein, M., Herzberg, R-D., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kroell, T., Kruecken, R., Labiche, M., Leino, M., Lumley, N., Maierbeck, P., Nyman, M., Nieminen, P., O'Donnell, D., Ollier, J., Pakarinen, J., Peura, P., Pissulla, T., Rahkila, P., Revill, J. P., Rother, W., Ruotsalainen, P., Rigby, S. V., Saren, J., Sapple, P. J., Scheck, M., Scholey, C., Simpson, J., Sorri, J., Uusitalo, J., Venhart, M., Watkins, H., Joss, D. T., Grahn, T., Page, R. D., Carroll, R. J., Dewald, A., Greenlees, P. T., Hackstein, M., Herzberg, R-D., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kroell, T., Kruecken, R., Labiche, M., Leino, M., Lumley, N., Maierbeck, P., Nyman, M., Nieminen, P., O'Donnell, D., Ollier, J., Pakarinen, J., Peura, P., Pissulla, T., Rahkila, P., Revill, J. P., Rother, W., Ruotsalainen, P., Rigby, S. V., Saren, J., Sapple, P. J., Scheck, M., Scholey, C., Simpson, J., Sorri, J., Uusitalo, J., and Venhart, M.

Abstract

Lifetimes of the low-lying excited states in the very neutron-deficient nucleus Au-175 have been measured by the recoil-distance Doppler-shift method using gamma-ray spectra obtained with the recoil-decay tagging technique. Transition quadrupole moments and reduced transition probabilities extracted for this odd-Z nucleus indicate the existence of three different shapes and the competition between collective and noncollective structures.

Published
2011

15. Anomalous transition strength in the proton-unbound nucleus (109)(53)I56

Author

Procter, M. G., Cullen, D. M., Scholey, C., Ruotsalainen, P., Angus, L., Back, T., Cederwall, B., Dewald, A., Fransen, C., Grahn, T., Greenlees, P. T., Hackstein, M., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Liotta, R., Lumley, N. M., Mason, P. J. R., Nieminen, P., Nyman, M., Pakarinen, J., Pissulla, T., Peura, P., Rahkila, P., Revill, J., Rigby, S. V., Rother, W., Sandzelius, M., Saren, J., Sorri, J., Taylor, M. J., Uusitalo, J., Wady, P., Qi, C., Xu, F. R., Procter, M. G., Cullen, D. M., Scholey, C., Ruotsalainen, P., Angus, L., Back, T., Cederwall, B., Dewald, A., Fransen, C., Grahn, T., Greenlees, P. T., Hackstein, M., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Liotta, R., Lumley, N. M., Mason, P. J. R., Nieminen, P., Nyman, M., Pakarinen, J., Pissulla, T., Peura, P., Rahkila, P., Revill, J., Rigby, S. V., Rother, W., Sandzelius, M., Saren, J., Sorri, J., Taylor, M. J., Uusitalo, J., Wady, P., Qi, C., and Xu, F. R.

Abstract

A lifetime measurement has been made for the first excited 11/2(+) state in the proton-unbound nucleus (109)(53)I56 using the recoil-distance Doppler-shift method in conjunction with recoil-proton tagging. The experimental reduced transition probability is considerably smaller than the prediction of theoretical shell-model calculations using the CD-Bonn nucleon-nucleon potential. The discrepancy between the theoretical and experimental reduced transition strengths in this work most likely arises from the inability of the current shell-model calculations to accurately account for the behavior of the unbound nuclear states. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.

Published
2011

16. Lifetime measurements probing triple shape coexistence in Au-175

Author

Watkins, H., Joss, D. T., Grahn, T., Page, R. D., Carroll, R. J., Dewald, A., Greenlees, P. T., Hackstein, M., Herzberg, R-D., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kroell, T., Kruecken, R., Labiche, M., Leino, M., Lumley, N., Maierbeck, P., Nyman, M., Nieminen, P., O'Donnell, D., Ollier, J., Pakarinen, J., Peura, P., Pissulla, T., Rahkila, P., Revill, J. P., Rother, W., Ruotsalainen, P., Rigby, S. V., Saren, J., Sapple, P. J., Scheck, M., Scholey, C., Simpson, J., Sorri, J., Uusitalo, J., Venhart, M., Watkins, H., Joss, D. T., Grahn, T., Page, R. D., Carroll, R. J., Dewald, A., Greenlees, P. T., Hackstein, M., Herzberg, R-D., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kroell, T., Kruecken, R., Labiche, M., Leino, M., Lumley, N., Maierbeck, P., Nyman, M., Nieminen, P., O'Donnell, D., Ollier, J., Pakarinen, J., Peura, P., Pissulla, T., Rahkila, P., Revill, J. P., Rother, W., Ruotsalainen, P., Rigby, S. V., Saren, J., Sapple, P. J., Scheck, M., Scholey, C., Simpson, J., Sorri, J., Uusitalo, J., and Venhart, M.

Abstract

Lifetimes of the low-lying excited states in the very neutron-deficient nucleus Au-175 have been measured by the recoil-distance Doppler-shift method using gamma-ray spectra obtained with the recoil-decay tagging technique. Transition quadrupole moments and reduced transition probabilities extracted for this odd-Z nucleus indicate the existence of three different shapes and the competition between collective and noncollective structures.

Published
2011

17. Anomalous transition strength in the proton-unbound nucleus (109)(53)I56

Author

Procter, M. G., Cullen, D. M., Scholey, C., Ruotsalainen, P., Angus, L., Back, T., Cederwall, B., Dewald, A., Fransen, C., Grahn, T., Greenlees, P. T., Hackstein, M., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Liotta, R., Lumley, N. M., Mason, P. J. R., Nieminen, P., Nyman, M., Pakarinen, J., Pissulla, T., Peura, P., Rahkila, P., Revill, J., Rigby, S. V., Rother, W., Sandzelius, M., Saren, J., Sorri, J., Taylor, M. J., Uusitalo, J., Wady, P., Qi, C., Xu, F. R., Procter, M. G., Cullen, D. M., Scholey, C., Ruotsalainen, P., Angus, L., Back, T., Cederwall, B., Dewald, A., Fransen, C., Grahn, T., Greenlees, P. T., Hackstein, M., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Liotta, R., Lumley, N. M., Mason, P. J. R., Nieminen, P., Nyman, M., Pakarinen, J., Pissulla, T., Peura, P., Rahkila, P., Revill, J., Rigby, S. V., Rother, W., Sandzelius, M., Saren, J., Sorri, J., Taylor, M. J., Uusitalo, J., Wady, P., Qi, C., and Xu, F. R.

Abstract

A lifetime measurement has been made for the first excited 11/2(+) state in the proton-unbound nucleus (109)(53)I56 using the recoil-distance Doppler-shift method in conjunction with recoil-proton tagging. The experimental reduced transition probability is considerably smaller than the prediction of theoretical shell-model calculations using the CD-Bonn nucleon-nucleon potential. The discrepancy between the theoretical and experimental reduced transition strengths in this work most likely arises from the inability of the current shell-model calculations to accurately account for the behavior of the unbound nuclear states. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.

Published
2011

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